You will need to do a couple of things, 1 remove, disassemble the scanner and thoroughly clean it, and while you have the scanner out, remove and clean the laser.
The toner cartridge may also be defective. that metering blade in that cartridge fails and causes light images also.
If you need instructions on how to remove and clean the scanner and laser let me know, I will type them out to you.
Not hard, just time consuming.
If you print out a report how does that look? If prints look fine and just the copies are light, then the mirrors in the scanner head a re probably fogged up. All the plastic in that scanner causes that same film on your scanner optics as you develop on your car windshield. Same process.

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Many people ask this same question over and over again. "I get black thin line (s) when using document feeder. If my original is on the platen glass copy is OK."

Well, in most copiers, be it Xerox or Canon or Sharp there is same principle in use. When document is moving it is exposured (copied) by a steady non-moving exposure lamp. If there is any dirt or even a dust particle on the narrow platen glass it will print out as a line.

Most people don't understand this principle and they say "I 've cleaned the platen glass".OK, they have cleaned the BIG glass, but the glass is the narrow one next to the big one. Very often there is glue or white correction lacquer on the platen which of course adheres more dirt.

You may use even the strongest solvents to get dirt off the glass. Remember, it is made of glass and won't get hurt even if you use thinner or nail polish remover.

This tip applies also on fax machines. The receiving end may call back and say "your fax has a lot of lines across the copy".

You have to do what is called a "shading adjustment".
In order press "menu" #1934 on the machine, You will see a " T " displayed in the upper right side of your display. That means you are in the Tech mode. Some versions of software will also just say Tech.
Press the machine status button and then scroll to maintenance. Once there scroll to Adjust Shading, or Shading adjustment.
Place 5 pieces of clean white paper on the glass, 5 pages thick., not spread out, then close the cover and press start, it will ask you if you want to perform the adjustment , just press yes again. It will print out a page when done, that page displays across it, the pixils the the CCD in the scanner sees. If you notice it had some large deviations in it, the scanner will need cleaned. The numbers on that page will really mean nothing, Even if it says OK on the bottom does not mean the mirrors in the scanner are clean.

You need to clean the scanner. You can try doing the shading adjustment to calabrate the scanner but most likely the mirrors are hazed up. Since you can print fine you eliminate the laser.
To do the shading adjustment, you need to press in order,,, Menu # 1934, You will see a " T "on the screen, that will be the tech mode. Press the machine status, then go to maintenance, then scroll to shading. Place 5 sheets of white paper on the glass and then run the shading adjustment. turn the machine off and on, and run copies again. But most likely you will have to take the scanner off and clean it.
If you want to clean the scanner let me know, I will send you directions on how to do that. The mirrors in that scan head tend to haze up.

hello,first of all,make a copy true the adf,and the next on the platen glass,if both copys are good,then the problem is inside the machine,i.e.drum unit or fuser roller damage.
if the strikes only occurs,by using the adf,then cleaning the scanner platen glass,it is the small glass unit!!! on the left side,from the big platen glass..